A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
A door safety barricade capable of preventing an intruder from entering through a door in a classroom, a school, an office building, and the like, when the device is in an engaged, locked position and wherein the selected authorities will be automatically notified as the locking device passes by the sensor while being engaged.
A door safety barricade capable of preventing an intruder from entering through a door in a classroom, a school, an office building, and the like, when the device is in an engaged, locked position and wherein the selected authorities will be automatically notified as the locking device passes by the sensor while being engaged.
DOOR BARRICADE
NORCROSS PAUL J (author)
2022-10-20
Patent
Electronic Resource
English